Hair brush



FIG. 1 is a front perspective view of a hair brush;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is left elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines showing environment are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a hair brush, as shown and described. 